"FBI virus is a sneaky malware, which mostly gets inside its target computer undetected with a help of Trojan.LockScreen.
As soon as it gets inside, this scam presents about itself for the
victim as 'The FBI Federal Bureau Investigation' and shows an
aggressively-designed alert that claims that computer is blocked because
of the Copyright and Related Rights Law violation or other reason.
However, if you find yourself blocked by a program, which tells that you
have been illegally using or distributing copyrighted content, viewing
or distributing pornographic content and spreading malware to other
computers, you must ignore such alert first of all and remove FBI virus
immediately! This program is distributed by scammers to swindle the
money. Be aware that security experts expect this group of ransomware to
grow and improve.. "